commit 1bd0494f8c3375c1b6698bf4e6d4d8be324ba934 Author: Neel Chauhan neel@neelc.org Date: Wed Jun 17 11:50:27 2020 -0700

Make summarize_protover_flags() handle NULL and empty string the same --- changes/ticket34232 | 5 +++++ src/core/or/versions.c | 8 ++++---- src/test/test_protover.c | 4 ---- 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/changes/ticket34232 b/changes/ticket34232 new file mode 100644 index 000000000..2e0046542 --- /dev/null +++ b/changes/ticket34232 @@ -0,0 +1,5 @@ + o Minor bugfixes (string handling): + - In summarize_protover_flags(), treat empty strings the same as NULL. + This prevents protocols_known from being set. Previously, we treated + empty strings as normal strings, which led to protocols_known being + set. Fixes bug 34232; bugfix on 0.3.3.2-alpha. Patch by Neel Chauhan. diff --git a/src/core/or/versions.c b/src/core/or/versions.c index 2f8cbac0e..5dfe0c2cc 100644 --- a/src/core/or/versions.c +++ b/src/core/or/versions.c @@ -490,8 +490,8 @@ memoize_protover_summary(protover_summary_flags_t *out, /** Summarize the protocols listed in <b>protocols</b> into <b>out</b>, * falling back or correcting them based on <b>version</b> as appropriate. * - * If protocols and version are both NULL, returns a summary with no flags - * set. + * If protocols and version are both NULL or "", returns a summary with no + * flags set. * * If the protover string does not contain any recognised protocols, and the * version is not recognised, sets protocols_known, but does not set any other @@ -504,10 +504,10 @@ summarize_protover_flags(protover_summary_flags_t *out, { tor_assert(out); memset(out, 0, sizeof(*out)); - if (protocols) { + if (protocols && strcmp(protocols, "")) { memoize_protover_summary(out, protocols); } - if (version && !strcmpstart(version, "Tor ")) { + if (version && strcmp(version, "") && !strcmpstart(version, "Tor ")) { if (!out->protocols_known) { /* The version is a "Tor" version, and where there is no * list of protocol versions that we should be looking at instead. */ diff --git a/src/test/test_protover.c b/src/test/test_protover.c index 9210ed411..088027481 100644 --- a/src/test/test_protover.c +++ b/src/test/test_protover.c @@ -789,13 +789,9 @@ test_protover_summarize_flags(void *args) DEBUG_PROTOVER(flags); tt_mem_op(&flags, OP_EQ, &zero_flags, sizeof(flags));

- /* "" sets the protocols_known flag */ memset(&flags, 0, sizeof(flags)); summarize_protover_flags(&flags, "", ""); DEBUG_PROTOVER(flags); - tt_int_op(flags.protocols_known, OP_EQ, 1); - /* Now clear that flag, and check the rest are zero */ - flags.protocols_known = 0; tt_mem_op(&flags, OP_EQ, &zero_flags, sizeof(flags));

/* Now check version exceptions */